Tabv STA Vtabs to ROW in A-REG

FB59: A9 17	519		LDA	#$17
FB5B: 85 25	520	TABV	STA	CV	;VTABS TO ROW IN A-REG
FB5D: 4C 22 FC	521		JMP	VTAB
FB60: 20 A4 FB	522	MULPM	JSR	MD1	;ABS VAL OF AC AUX
FB63: A0 10	523	MUL	LDY	#$10	;INDEX FOR 16 BITS
FB65: A5 50	524	MUL2	LDA	ACL	;ACX * AUX + XTND
FB67: 4A	525		LSR		; TO AC, XTND
FB68: 90 0C	526		BCC	MUL4	;IF NO CARRY,
FB6A: 18	527		CLC		; NO PARTIAL PROD.
FB6B: A2 FE	528		LDX	#$FE
FB6D: B5 54	529	MUL3	LDA	XTNDL+2,X	;ADD MPLCND (AUX)
FB6F: 75 56	530		ADC	AUXL+2,X	; TO PARTIAL PROD
FB71: 95 54	531		STA	XTNDL+2,X	; (XTND)
FB73: E8	532		INX
FB74: D0 F7	533		BNE	MUL3
FB76: A2 03	534	MUL4	LDX	#$03
FB78: 76	535	MUL5	DFB	$76
FB79: 50	536		DFB	$50
FB7A: CA	537		DEX
FB7B: 10 FB	538		BPL	MUL5
FB7D: 88	539		DEY
FB7E: D0 E5	540		BNE	MUL2
FB80: 60	541		RTS
FB81: 20 A4 FB	542	DIVPM	JSR	MD1	;ABS VAL OF AC, AUX.
FB84: A0 10	543	DIV	LDY	#$10	;INDEX FOR 16 BITS
FB86: 06 50	544	DIV2	ASL	ACL
FB88: 26 51	545		ROL	ACH
FB8A: 26 52	546		ROL	XTNDL	;XTND/AUX
FB8C: 26 53	547		ROL	XTNDH	;	TO AC.
FB8E: 38	548		SEC
FB8F: A5 52	549		LDA	XTNDL
FB91: E5 54	550		SBC	AUXL	;MOD TO XTND.
FB93: AA	551		TAX
FB94: A5 53	552		LDA	XTNDH
FB96: E5 55	553		SBC	AUXH
FB98: 90 06	554		BCC	DIV3
FB9A: 86 52	555		STX	XTNDL
FB9C: 85 53	556		STA	XTNDH
FB9E: E6 50	557		INC	ACL
FBA0: 88	558	DIV3	DEY
FBA1: D0 E3	559		BNE	DIV2
FBA3: 60	560		RTS
FBA4: A0 00	561	MD1	LDY	#$00	;ABS VAL OF AC, AUX
FBA6: 84 2F	562		STY	SIGN	;	WITH RESULT SIGN
FBA8: A2 54	563		LDX	#AUXL	;	IN LSB OF SIGN.
FBAA: 20 AF FB	564		JSR	MD3
FBAD: A2 50	565		LDX	#ACL
FBAF: B5 01	566	MD3	LDA	LOC1,X	;X SPECIFIES AC OR AUX
FBB1: 10 0D	567		BPL	MDRTS
FBB3: 38	568		SEC
FBB4: 98	569		TYA
FBB5: F5 00	570		SBC	LOC0,X	;COMPL SPECIFIED REG
FBB7: 95 00	571		STA	LOC0,X	;	IF NEG.
FBB9: 98	572		TYA
FBBA: F5 01	573		SBC	LOC1,X
FBBC: 95 01	574		STA	LOC1,X
FBBE: E6 2F	575		INC	SIGN
FBC0: 60	576	MDRTS	RTS
FBC1: 48	577	BASCALC	PHA		;CALC BASE ADR IN BASL,H
FBC2: 4A	578		LSR		;	FOR GIVEN LINE NO
FBC3: 29 03	579		AND	#$03	;	0<=LINE NO.<=$17
FBC5: 09 04	580		ORA	#$04	;ARG=000ABCDE, GENERATE

II specifications

The Apple II, launched in April 1977, was one of the first highly successful mass-produced microcomputer products. It marked a significant leap in personal computing, setting standards for future developments in the industry. Created by Steve Wozniak and Steve Jobs, the Apple II differentiated itself with its user-friendly design, appealing aesthetics, and robust capabilities.

One of the standout features of the Apple II was its open architecture, which allowed users to expand and enhance the computer's functionality. This design enabled hundreds of third-party hardware and software developers to contribute to its ecosystem, resulting in an array of peripherals, including printers, modems, and storage devices. The Apple II utilized a MOS Technology 6502 microprocessor running at a clock speed of 1 MHz. Initially equipped with 4 KB of RAM, the machine could be expanded to 48 KB, accommodating more complex applications and programs.

The Apple II was also notable for its colorful graphics. It was one of the first computers to support color display, offering a 6-color palette with a resolution of 280x192 pixels in 16 colors when using its Color Graphics Card. This feature significantly enhanced the visual appeal of games and educational software developed for the platform, making computing more accessible and entertaining for various audiences.

Apple's commitment to user experience was evident in the design of the machine. It featured an integrated keyboard and a plastic case, which was both durable and visually appealing. The self-contained design included drive bays for floppy disk drives, allowing for quicker data access than traditional tape drives. It also supported audio output, enabling sound effects and music, a novelty at the time.

The introduction of the Apple DOS operating system further underscored the machine's capabilities. DOS streamlined file management and made it easier for users to navigate and manage their data. The combination of hardware and software positioned the Apple II as an educational tool and a gaming platform, fostering a vibrant software ecosystem.

The Apple II family continued to evolve, with variations like the Apple II+, IIe, and IIgs being introduced over the years. These iterations brought enhancements in memory, processing power, and graphics capabilities. The legacy of the Apple II endures, not only as a foundational product in personal computing but also as a symbol of innovation that paved the way for future advancements in technology. Its impact is still felt today, as it inspired countless developers and shaped the trajectory of the computer industry.

Apple II manual Tabv STA Vtabs to ROW in A-REG

Models: II

TABV

STA

;VTABS TO ROW IN A-REG

II specifications